17/5/2012
Saiu o JBCS número 5 - Volume 23
The Future We Want
The title of this editorial is the same given to the main document to be discussed, two months from now, at the Earth Summit 2012, the so-called Rio+20, in allusion to the 20th anniversary of the United Nations Conference on Environment and Development, also known as RIO-92.
The 1992 Summit, with its 27 principles, has been the most influential one because, beyond the environment itself, it placed human beings as the focus for the sustainable development, bringing, thus, for the discussion, issues such as hunger, diseases, disarmament, racial prejudice and genocide.
(Read more at Editorial)
Table of Contents with Graphical Abstracts
Structure and Peroxidase Activity of Ferric Streptomyces clavuligerus orf10-encoded Protein P450CLA: UV-Visible, CD, MCD and EPR Spectroscopic Characterization |
| Leandro S. Goto, Carlos O. Hokka, José F. Lima, Tatiana Prieto, Ana Paula U. Araújo, Iseli L. Nantes and Otaciro R. Nascimento |
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Soret bands of two states of recombinant orf10-encoded P450-camphor like protein (P450CLA) of Streptomyces clavuligerus expressed in Escherichia coli Rosetta: the resting form (light gray) and the finger print of this hemeprotein characterized by Soret band peaking at 450 nm for the ferrous-CO complex (pink). Cytochrome P450 CLA is involved in the clavulanic acid biosynthetic pathway (color structure at right side) able to inhibit β-lactamase of penicillin-resistant bacteria. See details in the Article Structure and Peroxidase Activity of Ferric Streptomyces clavuligerus orf10-encoded Protein P450CLA: UV-Visible, CD, MCD and EPR Spectroscopic Characterization by Goto et al. on page 913 |
>> Editorial(366 KB)
O Futuro que Queremos
Vitor F. Ferreira |
| J. Braz. Chem. Soc. 2012, 23, 793. |
Interference Standard Applied to Sulfur Determination in Biodiesel Microemulsions by ICP-QMS |
| Renata S. Amais, George L. Donati and Joaquim A. Nóbrega |
| J. Braz. Chem. Soc. 2012, 23, 797. |
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| The interference standard method (IFS) is applied by the first time for sulfur determination in biodiesel microemulsions |
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Published online: March 20, 2012 |
Dialkylphosphorylhydrazones as Potent Tyrosinase Inhibitors |
Janaína M. R. Caixeiro, Vinicius T. Gonçalves, Márcia C. C. de Oliveira, Carlos M. R. Sant’Anna,
Victor M. Rumjanek and João B. N. DaCosta |
| J. Braz. Chem. Soc. 2012, 23, 804. |
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| The inhibition of the enzyme tyrosinase by some new organophosphorus compounds was investigated with the aim of developing potential drugs useful for the treatment of various skin disorders. Some compounds were found to be more active than the commercial ascorbic acid |
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Published online: March 22, 2012 |
Effect of Calcium Phosphate Coating on Polyamide Substrate for Biomaterial Applications |
| Lucimara C. Bandeira, Kátia J. Ciuffi, Paulo S. Calefi, Eduardo J. Nassar, Jorge V. L. Silva, Marcelo Oliveira, Izaque A. Maia, Isabel M. Salvado and Maria Helena V. Fernandes |
| J. Braz. Chem. Soc. 2012, 23, 810. |
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| Sol-gel process used to prepare calcium coating as bioactive materials |
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Published online: March 27, 2012 |
Molecular Identification and Phylogenetic Analysis of Egletes viscosa (L.) Less.,
a Traditional Medicinal Plant from Northeastern Brazil |
| José M. M. Batista, Davi C. Torres, Daniel M. de M. Jorge, Carlos E. A. Soares, Walderly M. Bezerra, Edilberto R. Silveira and Thalles B. Grangeiro |
| J. Braz. Chem. Soc. 2012, 23, 818. |
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| There are two chemotypes of "macela" (Egletes viscosa (L.) Less.), whose essential oils are characterized by the presence of trans-pinocarveyl acetate (chemotype A) or cis-isopinocarveyl acetate (chemotype B). Analysis of ITS/5.8S DNA sequences provides an effective and accurate strategy for identifying the chemotypes from E. viscosa |
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Published online: March 29, 2012 |
Knoevenagel Condensation of Aromatic Aldehydes with Ethyl 4-Chloro-3-oxobutanoate in Ionic Liquids |
Bruno R. S. de Paula, Dávila S. Zampieri, Julio Zukerman-Schpector, Edward R. T. Tiekink,
José Augusto R. Rodrigues and Paulo J. S. Moran |
| J. Braz. Chem. Soc. 2012, 23, 825. |
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| Knoevenagel condensations of aromatic aldehydes with ethyl 4-chloro-3-oxobutanoate were carried out in ionic liquids to give ethyl (E)/(Z)-2-chloroacetyl-3-arylpropenoates. The ionic liquid [bmim(NTf2)] was reused up to 4 times without loss in product yields, and an unequivocal methodology of (E)/(Z)-structural analysis by 13C NMR (nuclear magnetic resonance) is presented |
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Published online: March 29, 2012 |
Electrooxidation of Ethanol on Pt and PtRu Surfaces Investigated by ATR Surface-Enhanced Infrared Absorption Spectroscopy |
| Márcio F. Silva, Bruno C. Batista, Emerson Boscheto, Hamilton Varela and Giuseppe A. Camara |
| J. Braz. Chem. Soc. 2012, 23, 831. |
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| ATR-SEIRAS experiments performed on Pt and PtRu electrodeposits show that CO is formed at low potentials (~ 0.1 V) on both surfaces and remains adsorbed, blocking surface sites and thus inhibiting ethanol oxidation. Kinetic modeling suggests that CO adsorbed layer is not influenced by the presence of Ru, whilst its oxidation is clearly favored in the presence of this metal |
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Published online: April 3, 2012 |
Evaluation of Metal Ions in Rice Samples: Extraction and Direct Determination by ICP OES |
| Andrea Oliveira, Nivaldo Baccan and Solange Cadore |
| J. Braz. Chem. Soc. 2012, 23, 838. |
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| The extraction of metal ions present in rice samples with ammoniacal solution of EDTA (pH 10) as extracting agent allowed the determination of P, K, Mg, Ca, Zn, Mn, Cu and Mo in rice samples of type "integral", "agulhinha" and "parboiled" |
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Published online: April 3, 2012 |
Assessment of Inorganic Contaminants in Golden Mussel (Limnoperna fortunei) in Southern Brazil |
| Éderson R. Pereira, Bruno M. Soares, João P. Vieira, Ana C. G. Mai, Rochele S. Picoloto, Edson I. Muller, Erico M. M. Flores and Fábio A. Duarte |
| J. Braz. Chem. Soc. 2012, 23, 846. |
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Bivalves have been widely used as sentinel organisms for environmental monitoring of trace and major element concentration in aquatic ecosystems. The simultaneous characterization of this biomarker in different locations can provide information on the pollution status in the region |
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Published online: April 3, 2012 |
Synthesis, Urease Inhibition, Antioxidant and Antibacterial Studies of Some
4-Amino-5-aryl-3H-1,2,4-triazole-3-thiones and their 3,6-Disubstituted 1,2,4-Triazolo[3,4-b]1,3,4-thiadiazole Derivatives |
| Muhammad Hanif, Muhammad Saleem, Muhammad Tahir Hussain, Nasim Hasan Rama, Sumera Zaib, Muhammad Adil M. Aslam, Peter G. Jones and Jamshed Iqbal |
| J. Braz. Chem. Soc. 2012, 23, 854. |
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| A new series of 4-amino-5-aryl-3H-1,2,4-triazole-3-thiones was condensed with different substituted aromatic acids to yield 3,6-disubstituted-1,2,4-triazolo[3,4-b]1,3,4-thiadiazoles. The synthesized compounds were screened for their urease inhibition, antioxidant and antibacterial activities. Some compounds showed excellent urease inhibition activities more than the standard drug |
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Published online: April 10, 2012 |
Estimating Cocaine Consumption in the Brazilian Federal District (FD) by Sewage Analysis |
| Adriano O. Maldaner, Luciana L. Schmidt, Marco A. F. Locatelli, Wilson F. Jardim, Fernando F. Sodré, Fernanda V. Almeida, Carlos Eduardo B. Pereira and Cristiano M. Silva |
| J. Braz. Chem. Soc. 2012, 23, 861. |
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| The consumption of cocaine in the Brazilian Federal District, via sewage analysis, was estimated in 1.0 ton year-1. Sampling at different wastewater treatment plants allowed the detection of areas with higher consumption |
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Published online: April 10, 2012 |
Support Effect on Carbon Nanotube Growth by Methane Chemical Vapor Deposition on Cobalt Catalysts |
| Hugo A. Oliveira, Dante F. Franceschini and Fabio B. Passos |
| J. Braz. Chem. Soc. 2012, 23, 868. |
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| The support influences the activity and selectivity of cobalt catalysts on carbon nanotube production. Co/Al2O3 showed the highest total carbon yield and the Co/TiO2 showed the highest selectivity (80%) towards single walled carbon nanotube formation |
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Published online: April 10, 2012 |
Synthesis and Thermal Behavior of New Liquid Crystals Arylaldoxime Esters |
Aline Tavares, Bárbara C. Arruda, Elvis S. Boes, Valter Stefani, Hubert K. Stassen,
Leandra F. Campo, Ivan H. Bechtold and Aloir A. Merlo |
| J. Braz. Chem. Soc. 2012, 23, 880. |
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| The synthesis of a series of unstable fluorescent liquid-crystalline arylaldoxime esters 6a-d and 8 is reported. The chemical stability and liquid-crystalline as well as the photophysical properties of the title compounds are described and showed to be dependent on the heating/cooling cycles |
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Published online: April 17, 2012 |
Fatty Acid Synthase Inhibitors Isolated from Punica granatum L. |
He-Zhong Jiang, Qing-Yun Ma, Hui-Jin Fan, Wen-Juan Liang, Sheng-Zhuo Huang, Hao-Fu Dai,
Peng-Cheng Wang, Xiao-Feng Ma and You-Xing Zhao |
| J. Braz. Chem. Soc. 2012, 23, 889. |
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| Bioassay-guided chemical investigation on the EtOH extract of the peels of Punica granatum led to the isolation of 17 compounds including one new oleanane-type triterpene named punicaone. Flavogallonic acid exhibited the strong fatty acid synthase (FAS) inhibitory activity with IC50 10.3 µmol -1 |
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Published online: April 17, 2012 |
Correlation Between Electrochemical and Theoretical Studies on the Leishmanicidal Activity of Twelve Morita-Baylis-Hillman Adducts |
| Yen G. de Paiva, Antônio A. de Souza, Claudio G. Lima-Junior, Fábio P. L. Silva, Edilson B. A. Filho, Camila C. de Vasconcelos, Fabiane C. de Abreu, Marília O. F. Goulart and Mário L. A. A. Vasconcellos |
| J. Braz. Chem. Soc. 2012, 23, 894. |
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| This work presents electrochemical studies, in aprotic media, of twelve Morita-Baylis-Hillman adducts (MBHA) with significant leishmanicidal activity, together with conformational calculations. Ortho adducts present facilitated reduction in comparison to the other isomers and higher leishmanicidal activity. Molecular hardness (N) and atomic charges (QN) values corroborate the obtained experimental data |
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Published online: April 17, 2012 |
Studies on the Chemical Behavior of 3-(Nitroacetyl)-1-ethyl-4-hydroxyquinolin-2(1H)-one towards some Electrophilic and Nucleophilic Reagents |
| Magdy A. Ibrahim, Hany M. Hassanin, Yassin A. Gabr and Youssef A. Alnamer |
| J. Braz. Chem. Soc. 2012, 23, 905. |
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| A variety of heterocyclic systems linked 1-ethylquinolin-2(1H)-one, were prepared from reaction of 3-(nitroacetyl)-1-ethyl-4-hydroxyquinolin-2(1H)-one with some electrophilic and nucleophilic reagents |
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Published online: April 17, 2012 |
Structure and Peroxidase Activity of Ferric Streptomyces clavuligerus orf10-encoded Protein P450CLA: UV-Visible, CD, MCD and EPR Spectroscopic Characterization |
| Leandro S. Goto, Carlos O. Hokka, José F. Lima, Tatiana Prieto, Ana Paula U. Araújo, Iseli L. Nantes and Otaciro R. Nascimento |
| J. Braz. Chem. Soc. 2012, 23, 913. |
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| The ferrous recombinant orf10-encoded P450-camphor like protein (the P450CLA) of Streptomyces clavuligerus exhibits the fingerprint red shift to 450 nm after complexation with CO and peroxidase activity towards tert-butylhydroperoxide |
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Published online: April 19, 2012 |
Size-Segregated Particulate Matter and Carboxylic Acids over Urban and Rural Sites in Londrina City, Brazil |
| Adriana de M. Freitas, Leila D. Martins and Maria Cristina Solci |
| J. Braz. Chem. Soc. 2012, 23, 921. |
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The results indicated that primary sources of vehicular emissions were the dominant source of carboxylic acids in urban and rural PM2,5 in Londrina City. Moreover, backward trajectories indicated transport of pollutants from São Paulo to Londrina |
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Published online: April 19, 2012 |
Reactivity of Glycerol/Acetone Ketal (Solketal) and Glycerol/Formaldehyde Acetals toward Acid-Catalyzed Hydrolysis |
| Leonardo P. Ozorio, Rafael Pianzolli, Maria Beatriz S. Mota and Claudio J. A. Mota |
| J. Braz. Chem. Soc. 2012, 23, 931. |
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| The acid-catalyzed hydrolysis of the glycerol/acetone ketal (solketal) and glycerol/ formaldehyde indicated that solketal was significantly more reactive than glycerol/ formaldehyde acetals. DFT calculations of the ketal and acetal isomers explain the experimental distribution |
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Published online: April 19, 2012 |
Determination of Tetracycline in Environmental Water Samples at a Graphite-Polyurethane Composite Electrode |
| Carolina M. F. Calixto, Priscila Cervini and Éder T. G. Cavalheiro |
| J. Braz. Chem. Soc. 2012, 23, 938. |
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| In the present work, a graphite-polyurethane composite electrode was used for the determination of tetracycline, an antibiotic widely used in animal and human antibacterial treatment. Once in environmental waters, tetracycline can be a potential pollutant from veterinary/medical use as well as in pharmaceutical industry wastes |
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Published online: April 19, 2012 |
Speciation of Fe(II) and Fe(III) by using Dispersive Liquid-Liquid Microextraction and Flame Atomic Absorption Spectrometry |
| Soleiman Bahar and Razieh Zakerian |
| J. Braz. Chem. Soc. 2012, 23, 944. |
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| The figure shows the efficiency of dispersive liquid-liquid microextraction method for the extraction of iron ion with oxine ligand using different extraction (CH3Cl, CCl4, CH2Cl2 and CS2) and dispersive (methanol, ethanol, acetone, acetonitrile and THF) solvents |
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Published online: April 19, 2012 |
Effect of Fluorination Treatment on Electrochemical Properties of M1Ni3.5Co0.6Mn0.4Al0.5 Hydrogen Storage Alloy |
| Hongxia Huang and Kelong Huang |
| J. Braz. Chem. Soc. 2012, 23, 951. |
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| Fluorination treatment improves the discharge capacity and cycle durability of M1Ni3.5Co0.6Mn0.4Al0.5 alloy, which is attributed to a relatively lower cell volume changes during hydriding/dehydriding. Moreover, the electrochemical reaction resistance of the alloy electrode decreases after the treatment |
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Published online: April 24, 2012 |
Multivariate Treatment of LIBS Data of Prehistoric Paintings |
| Flávia de S. L. Borba, Juliana Cortez, Viviane K. Asfora, Celio Pasquini, Maria Fernanda Pimentel, Anne-Marie Pessis and Helen J. Khoury |
| J. Braz. Chem. Soc. 2012, 23, 958. |
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| Prehistoric painting samples from Toca da Extrema II Archaeological Site (Piauí State, Brazil) and Xique-Xique Archaeological Site (Rio Grande do Norte State, Brazil). Score plot of PCA carried on the LIBS (laser-induced breakdown spectroscopy) spectra set of Toca da Extrema II Archaeological Site painting |
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Published online: April 24, 2012 |
O-Iodoxybenzoic Acid in Water: Optimized Green Alternative for Multicomponent One-Pot Synthesis of 2-Amino-3,5-dicarbonitrile-6-thiopyridines |
| Santosh Takale, Jaidas Patil, Vikas Padalkar, Rajaram Pisal and Atul Chaskar |
| J. Braz. Chem. Soc. 2012, 23, 966. |
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| Environmentally benign and eco-friendly protocol has been developed for the synthesis of 2-amino-3,5-dicarbonitrile-6-thio-pyridine from aldehyde, malononitrile and thiophenol |
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Published online: March 27, 2012 |
Determination of Phenol and o-Cresol in Soil Extracts by Flow Injection Analysis with Spectrophotometric Detection |
| Rafael G. Dolatto, Iara Messerschmidt, Betânia F. Pereira, Carlos A. P. Silveira and Gilberto Abate |
| J. Braz. Chem. Soc. 2012, 23, 970. |
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| The official spectrophotometric method (APHA) for quantification of total phenol in water was adapted to flow injection analysis (FIA) for phenol and o-cresol determinations in soil extracts. As shown in the figure, a good agreement between the results was verified in a recovery study, with similar limit of quantification and sampling rate, near 50 analyses per h |
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Published online: April 3, 2012 |
Cytotoxic Sesquiterpene Lactones and other Constituents of Centaurea omphalotricha |
| El Hadj Kolli, Francisco León, Fadila Benayache, Sara Estévez, José Quintana, Francisco Estévez, Ignacio Brouard, Jaime Bermejo and Samir Benayache |
| J. Braz. Chem. Soc. 2012, 23, 977. |
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| Phytochemical study of the aerial parts of Centaurea omphalotricha Coss. & Durieu ex Batt. et Trab., an Algerian endemic plant, afforded three new sesquiterpene lactones together with twelve known compounds, some of them display strong cytotoxic properties in human leukemia cells |
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Published online: April 19, 2012 |
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